Fix thread

src/kernel/scheduler.rs

@@ -1,13 +1,11 @@
-use std::sync::Arc;
+use std::{sync::Arc, rc::Rc};
 
 use crate::utility::list::List;
 use crate::kernel::thread::Thread;
 
-use super::system::{G_CURRENT_THREAD, G_THREAD_TO_BE_DESTROYED};
-
 #[derive(PartialEq)]
 pub struct Scheduler {
-    ready_list: List<Arc<Thread>>
+    ready_list: List<Rc<Thread>>
 }
 
 impl Scheduler {
@@ -28,7 +26,7 @@ impl Scheduler {
     /// ## Pamameter
     /// 
     /// **thread** is the thread to be put on the read list
-    pub fn ready_to_run(&mut self, thread: Arc<Thread>) {
+    pub fn ready_to_run(&mut self, thread: Rc<Thread>) {
         self.ready_list.push(thread);
     }
     
@@ -38,7 +36,7 @@ impl Scheduler {
     /// Thread is removed from the ready list.
     /// 
     /// **return** Thread thread to be scheduled
-    pub fn find_next_to_run(&mut self) -> Option<Arc<Thread>> {
+    pub fn find_next_to_run(&mut self) -> Option<Rc<Thread>> {
         self.ready_list.pop()
     }